Cage for grinders



M. F. WILLIAMS.

CAGE FOR GRINDERS.

APPLICATION FILED JUNE H. 1919.

Patentd Nov. 16, 1920.

UNITED STATiE rarenr OFFICE.

MILTON F. WILLIAMS, OF ST. LOUIS, MISSOURI, ASSIGNOR TO WILLIAMS PATENT GRUSHER & PULVERIZER 00., A CORPORATION OF MISSOURI.

GAGE FOR GRINDERS.

Specification of Letters Patent.

Patented Nov. 16, 1920.

To all whom it may concern:

Be it known that I, MILTON F. WILLIAMS, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Cages for Grinders, of which the following is a specification.

This invention relates to certain new and useful improvements in cages for grinders, the pecularities of which will be hereinafter described and claimed.

The main object of my invention is to provide a grinding cage of great discharge capacity; secondly of better grinding action than a plain cage.

In the accompanying drawing on which like reference letters indicate corresponding parts, Figure 1 represents a vertical sectional elevation across the shaft of a grinder exemplifying my invention; Fig. 2 a similar sectional elevation in the central plane throu h the shaft of said rinder Fi 3 a C) b 7 b plan view of a portion of my grinding cage; and Fig. t a magnified perspective view of portion of such grinding cage.

The letter A designates the casing of a grinder having an inlet opening B and a rotor provided with pivoted hammers C mounted in said casing and within a grinding cage of my construction operating in conjunction with said rotary hammer C. My cage consists of warp wires D running in the planes of rotation or substantially in the planes of rotation of the hammers C, and woof wires E preferably double crimped and running across the planes of rotation and substantially at right angles thereto. The smaller wires D may be round or otherwise in cross section, and the larger wires E may be square or other angular shape in cross section in order to form cutting edges F directly opposing the rotary hammers C and thereby efiecting a cutting action on the material operated on, which is discharged through the openings G between said wires forming the grinding cage. The size of the wires and also the size of the openings are proportioned according to the kind of material operated on; and by the toothed form produced by the relatively larger angular has been found by actual operation that the capacity of a screen of the construction described is much greater than that of a plain wire screen of round wires. Thus when grinding corn this increased capacity is 2-5 per cent. over a plain wire screen; in grinding screenings, the increased capacity is 33 per cent; and in grinding buckwheat hulls, which are very diflicult of reduction, the increased capacity is 100 per cent. This eficient action is due to the toothed projections of the angular wire opposing the rotary hammers, and the openings between said wires through which the discharge of the material takes place.

I do not claim as new the form of screen shown herewith per sc, but I claim it is new in conjunction with rotary hammers and forming a grinding cage producing highly improved results in reduction and discharge of material through the cage without clogging, as compared with a plain wire screen of round wires as ordinarily made.

I claim:

1. The combination with rotary hammers, of a grinding cage comprising a wire screen, the warp wires lying substantially in the planes of the rotation of the hammers, and angular woof wires lying in planes substantially at right angles to said rotary hammer planes and forming teeth with angular cutting edges disposed adjacent to the cylindrical path described by and acting in conjunction with said hammer.

2. The combination with rotary hammers, of a grinding cage comprising a wire screen,the warp wires being relatively smaller than the woof wires said warp wires lying substantially in the planes of rotation, of the hammers and curved parallel with the cylindrical path described by them, and the woof wires being angular and double crimped forming teeth projecting from the surface of curvature of the warp wires and co-acting with said hammers substantially as described.

3. The combination in a grinder, or" a revoluhle hammer, with a cage curved substantially parallel with the are of movement of said hammer, said cage being composed of a metallic Woven fabric the Weft Wires of which extend transversely of the path of movement of the hammer, and are of angular cross section, each having a face substantially perpendicular to the general surface of the cage, presented to the ap- 10 proaching hammer.

In testimony whereof I have afiixed my signature.

MILTON F. WILLIAlMS. 

